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SHAN YAO

Names for Shan Yao
Pharmaceutical: Radix Dioscoreae Oppositae
Botanical: Dioscorea opposita Thunberg(Dioscoreaceae)
Other names: Sheng Shan Yao, Huai Shan Yao
Description: Yam Rhizome.

Actions
Tonifies Qi; Nourishes Yin; Tonifies the Spleen; Tonifies the Lungs; Tonifies the Kidneys; ...

Origin of shan yao
Henan (Huai Shan Yao), Hebei, Shanxi, Shandong, Southwest China.;

Preparation of shan yao
The drug is collected in winter when the stem and leaf are withered, deprived of root stock, washed clean and deprived of outer bark and fibrous root, fumigated with sulfur, and then dried. Otherwise thick large straight and dried rhizome is sorted, soaked in clean water until the central portion of the drug gets wet and softened thoroughly, then fumigated with sulfur, cut two ends to smooth plane and rubbed on a board to become cylindrical in shape, dried in the sun and finally polished. It is known as "Guang Shan Yao" (Polished Common Yam Rhizome).;

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